mills@ccu.umanitoba.ca (Gary Mills) (07/18/90)
Does anyone know how to set the exit code from awk within an awk script? My AT&T and Sun manuals are silent on this. I want to be able to do: `awk -f file file || cat file'. -- -Gary Mills- -University of Manitoba- -Winnipeg-
stevens@hsi.UUCP (Richard Stevens) (07/18/90)
In article <1990Jul17.203037.22283@ccu.umanitoba.ca> mills@ccu.umanitoba.ca (Gary Mills) writes: > >Does anyone know how to set the exit code from awk within an awk >script? Just say "exit <expression>". I just tried it and it works under V7 awk, SVR3.1 awk, nawk, and gawk. Richard Stevens 3M Health Information Systems, Wallingford, CT stevens@hsi.com
steinbac@hpl-opus.HP.COM (Gunter Steinbach) (07/18/90)
On p. 50 of the awk bible "The AWK programming Language", by A., W.,
and K. themselves, it says that the statement "exit <expression>" will
return <expression> as the program's exit value. I tried it with things
like
awk 'END {exit 1}' < /dev/null || print "ok"
and it works. I highly recommend the book, by the way. Addison-Wesley
is the publisher.
(This was "awk" on HP-UX 6.5 on an HP9000/350 work station.)
Good luck -
Guenter Steinbach gunter_steinbach@hplabs.hp.combob@wyse.wyse.com (Bob McGowen x4312 dept208) (07/18/90)
In article <1990Jul17.203037.22283@ccu.umanitoba.ca> mills@ccu.umanitoba.ca (Gary Mills) writes: > >Does anyone know how to set the exit code from awk within an awk >script? My AT&T and Sun manuals are silent on this. I want to >be able to do: `awk -f file file || cat file'. >-- >-Gary Mills- -University of Manitoba- -Winnipeg- Use the `exit' function: awk '{ # your code if (some_condition) exit 0 else exit 1 }' ... Cheers- :-) Bob McGowan (standard disclaimer, these are my own ...) Product Support, Wyse Technology, San Jose, CA ..!uunet!wyse!bob bob@wyse.com
arnold@audiofax.com (Arnold Robbins) (07/18/90)
In article <1990Jul17.203037.22283@ccu.umanitoba.ca> mills@ccu.umanitoba.ca (Gary Mills) writes: >Does anyone know how to set the exit code from awk within an awk >script? Yes. Simply say exit <expression> in the action part of a rule. The value of <expression> will be the exit value of awk itself. The expression is optional, in which case awk will exit with 0. This works on all variants of awk. -- Arnold Robbins AudioFAX, Inc. | Laundry increases 2000 Powers Ferry Road, #220 / Marietta, GA. 30067 | exponentially in the INTERNET: arnold@audiofax.com Phone: +1 404 933 7600 | number of children. UUCP: emory!audfax!arnold Fax: +1 404 933 7606 | -- Miriam Robbins
andyb@coat.com (Andy Behrens) (07/18/90)
stevens@hsi.UUCP (Richard Stevens) writes: > Gary Mills writes: >> >> Does anyone know how to set the exit code from awk within an awk >> script? > > Just say "exit <expression>". I just tried it and it works under > V7 awk, SVR3.1 awk, nawk, and gawk. That's correct. You should be aware, though, that if you have an END{ } block, awk will execute it when it processes the "exit <expression>" statement. When the END{ } block is completed, awk will terminate with the exit code specified in the expression. Andy
guy@auspex.auspex.com (Guy Harris) (07/19/90)
>Does anyone know how to set the exit code from awk within an awk >script? Set the exit code without exiting, no. Exit with a particular exit code, yes: $ awk 'END { exit 17 }' </dev/null $ echo $? 17 If this isn't documented, it should be....
nreadwin@miclon.uucp (Neil Readwin) (07/20/90)
In article <1990Jul17.203037.22283@ccu.umanitoba.ca> mills@ccu.umanitoba.ca (Gary Mills) writes: >Does anyone know how to set the exit code from awk within an awk >script? My AT&T and Sun manuals are silent on this. I want to >be able to do: `awk -f file file || cat file'. According to an old posting from jwp%chem@sdcsvax.ucsd.edu # The user manual says that using the exit function causes the script to # behave as if end-of-input has been reached. Not mentioned explicitly # is the fact that this will cause the END block to be executed if it # exists. Also, two things are omitted: # # exit(expr) causes the script's exit status to be set to the value of expr. # # If exit is called within the END block, the script exits immediately. -- Disclaimer: 818 Phone: +44 71 528 8282 E-mail: nreadwin@micrognosis.co.uk